Keep in mind that your test suite isn't hidden in Cody. For that reason, Cody isn't the best place to ask questions that have a single correct answer (i.e. the answer doesn't change depending on novel inputs).
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Make a checkerboard matrix
Swap the first and last columns
Column norms of a matrix
Matrix which contains the values of an other matrix A at the given locations.
Flip the vector from right to left
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